Template instantiate SetFunctionBasedPath to remove spurious classes

[aymanhab]

Fixes issue #0

Brief summary of changes

template instantiate SetFunctionBasedPath in interface file so swig results are usable in scripting and not bloated with unusable classes

Testing I've completed

None other than the change/fix f=to the java produced classes

Looking for feedback on...

CHANGELOG.md (choose one)

• no need to update because internal

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This change is 

[aymanhab]

@nickbianco this was necessary to make the ModelFactory method usable

[nickbianco]

One minor suggestion for the set name.

[nickbianco]

To follow the naming convention of other sets --> FuctionBasedPathSet?

[aymanhab]

In the past, naming for classes made up for swig interface started with Set while ones that existed in C++ used the C++ name which ended in Set, so we have the mix but if you feel strongly about it or plan to typedef in C++ I will make the change so let me know.

[nickbianco]

Ah okay, I was mixing up name conventions. One more question, should the template name be pluralized, or just be SetFunctionBasedPath?

[aymanhab]

I went back and forth on that and you'll see I initially had it without but looking at simulation.i I realized we most often use plurals

opensim-core/Bindings/simulation.i

Line 149 in 7703592

%template(SetMarkers) OpenSim::Set<OpenSim::Marker, OpenSim::ModelComponent>;

[aymanhab]

Thanks @nickbianco 🥇